Coating, article coated with coating, and method for manufacturing article

ABSTRACT

A coating includes a nano-composite layer including a plurality of films. The films are stacked together one after another. Each film includes a zirconium-copper carbonitride layer and a zirconium carbonitride layer.

The present application is related to co-pending U.S. patent application 13/007,706, entitled “COATING, ARTICLE COATED WITH COATING, AND METHOD FOR MANUFACTURING ARTICLE”, by Zhang et al. This application has the same assignee as the present application and has been concurrently filed herewith. The above-identified applications are incorporated herein by reference.

BACKGROUND

1. Technical Field

The exemplary disclosure generally relates to coatings, and particularly relates to articles coated with the coatings and a method for manufacturing the articles.

2. Description of Related Art

Physical vapor deposition (PVD) has conventionally been used to form a coating on metal bases of cutting tools or molds. Materials used as this coating material are required to have good durability. At present, Zirconium carbonitride (ZrCN) is used as a material satisfying these requirements. However, ZrCN poorly adheres to metal properties and may easily peel off.

Therefore, there is room for improvement within the art.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the exemplary coating, article coated with the coating and method for manufacturing the article. Moreover, in the drawings like reference numerals designate corresponding parts throughout the several views. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment.

FIG. 1 is a cross-sectional view of an exemplary embodiment of a coating.

FIG. 2 is a cross-sectional view of an article coated with the coating in FIG. 1.

FIG. 3 is a block diagram showing the steps of an exemplary method for manufacturing the article in FIG. 2.

FIG. 4 is a schematic view of a magnetron sputtering coating machine for manufacturing the article in FIG. 2.

DETAILED DESCRIPTION

A coating 30 includes a deposited layer 31. The deposited layer 31 is a zirconium-copper carbonitride (ZrCuCN) layer. The deposited layer 31 may be deposited by magnetron sputtering or cathodic arc deposition.

The deposited layer 31 has a thickness ranging from about 1 micrometers to about 3 micrometers. In this exemplary embodiment, the thickness of the deposited layer 31 is 2 micrometers. It is to be understood that the coating may include a color layer 33 covering on the deposited layer 31, to decorate the appearance of the coating 30.

Referring to FIG. 2, an exemplary article 40 includes a substrate 10, a bonding layer 20 deposited on the substrate 10 and the coating 30 deposited on the bonding layer 20. The substrate 10 is made of metal, such as high speed steel, hard alloy, or stainless steel. The article 40 may be cutting tools, mold, or housings of electronic devices. The bonding layer 20 is a zirconium copper (ZrCu) layer. The bonding layer 20 has a thickness ranging from about 0.05 micrometer to about 0.2 micrometer. The bonding layer 20 can be deposited by magnetron sputtering or cathodic arc deposition. The chemical stability of the bonding layer 20 is between the chemical stability of the substrate 10 and the chemical stability of the coating 30, and the coefficient of thermal expansion of the bonding layer 20 is between the coefficient of thermal expansion of the substrate 10 and the coefficient of thermal expansion of the coating 30. Thus, the bonding layer 20 is used to improve binding between the substrate 10 and the coating 30 so that the coating 30 can be firmly deposited on the substrate 10.

Referring to FIG. 3, a method for manufacturing the article 40 may include at least the following steps.

A substrate 10 is provided. The substrate 10 may be made of high speed steel, hard alloy, or stainless steel.

The substrate 10 is pretreated. Firstly, the substrate 10 is washed with a solution (e.g., Alcohol or Acetone) in an ultrasonic cleaner, to remove, e.g., grease, dirt, and/or impurities. Secondly, the substrate 10 is dried. Thirdly, the substrate 10 is cleaned by argon plasma cleaning. The substrate 10 is retained on a rotating bracket 50 in a vacuum chamber 60 of a magnetron sputtering coating machine 100. The vacuum level of the vacuum chamber 60 is adjusted to 8.0×10-3 Pa. Pure argon is floated into the vacuum chamber 60 at a flux of about 300 sccm (Standard Cubic Centimeters per Minute) to 600 sccm from a gas inlet 90, and a bias voltage is applied to the substrate 10 in a range about −300 to −800 volts for about 3-10 minutes. So the substrate 10 is washed by argon plasma, to further remove the grease or dirt. Thus, the binding force between the substrate 10 and the bonding layer 20 is enhanced.

A bonding layer 20 is deposited on the substrate 10. The argon is floated into the vacuum chamber 60 at a flux from about 100 sccm to 300 sccm from the gas inlet 90, preferably is about 150 sccm; a zirconium copper alloy target 70 is evaporated; a bias voltage applied to the substrate 10 may be in a range about −100 to −300 volts for about 5 to 20 min (preferably is 10 min), to deposit the bonding layer 20 on the substrate 10. The zirconium copper alloy contains zirconium in a range about 30 to about 70 wt %.

A deposited layer 31 is deposited on the bonding layer 20. The temperature in the vacuum chamber 60 is adjusted to 100˜200° C. Nitrogen is floated into the vacuum chamber 60 at a flux from about 10 sccm to about 100 sccm and acetylene gas is floated into the vacuum chamber 60 at a flux from about 10 sccm to about 100 sccm from the gas inlet 90; the zirconium copper alloy target 70 is continuously evaporated in a power from 7 kw to 11 kw for a time from 30 min to 180 min (preferably is 60 min), to deposit the deposited layer 31 on the bonding layer 20. During depositing the deposited layer 31, atomic copper and atomic zirconium can not react to solid solution phase, and atomic copper is not easily to react with atomic nitrogen, so atomic nitrogen has a priority of reaction with atomic zirconium to form zirconium-nitrogen crystal. Additionally, atomic copper is independently from copper phase at the boundary of the zirconium-nitrogen crystal, which can prevent the zirconium-nitrogen crystal from enlarging, to maintain the zirconium-nitrogen crystal in nanometer level. The nanometer lever zirconium-nitrogen can improve hardness and toughness of the coating 30.

It is to be understood that the color layer 33 may be deposited on the deposited layer 31 to improve the appearance of the article 40.

It is to be understood, however, that even through numerous characteristics and advantages of the exemplary disclosure have been set forth in the foregoing description, together with details of the system and function of the disclosure, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. 

What is claimed is:
 1. An article, comprising: a substrate; a bonding layer deposited on the substrate; and a deposited layer disposed on the bonding layer, the bonding layer locating between the substrate and the deposited laver, wherein the deposited layer is a zirconium-copper carbonitride layer, the zirconium-copper carbonitride layer is formed by magnetron sputtering, using a zirconium copper alloy target in which the zirconium has a mass percentage of about 30% to about 70%.
 2. The article as claimed in claim 1, wherein the deposited layer has a thickness ranging from about 0.5 micrometer to about 3 micrometer.
 3. The article as claimed in claim 1, wherein the coating further comprises a color layer covering on the deposited layer.
 4. The article as claimed in claim 1, wherein the substrate is made of high speed steel, hard alloy, or stainless steel.
 5. The article as claimed in claim 1, wherein the bonding layer is a zirconium copper layer, the zirconium copper layer contains zirconium having a mass percentage of about 20% to about 80%, the bonding layer has a thickness ranging from about 0.05 micrometer to about 0.2 micrometer.
 6. The article as claimed in claim 1, wherein the chemical stability of the bonding layer is between the chemical stability of the substrate and the chemical stability of the coating, and the coefficient of thermal expansion of the bonding layer is between the coefficient of thermal expansion of the substrate and the coefficient of thermal expansion of the coating. 